Convertible Senior Notes - Summary of Total Interest Expense Recognized Related To Convertible Senior Notes (Parenthetical) (Details)	Jun. 30, 2020	Dec. 31, 2019	Nov. 30, 2017
0.125% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, interest rate	0.125%	0.125%
0.125% Convertible Senior Notes Due 2024 | 0.125% coupon
Debt Instrument [Line Items]
Debt instrument, interest rate	0.125%
1.50% Convertible Senior Notes Due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate	1.50%		1.50%
1.50% Convertible Senior Notes Due 2022 | 1.50% Coupon
Debt Instrument [Line Items]
Debt instrument, interest rate	1.50%